Android Open Source - SimpleReflectedLightMeter Main Activity

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Back to project page SimpleReflectedLightMeter.

License

The source code is released under:

MIT License

Java Source Code

/*
 * MainActivity.java/*w ww.jav a  2 s. co  m*/
 *
 *  (c) 2013 mugcupsoup@gmail.com
 *
 *  Licensed under the MIT license.
 *  http://www.opensource.org/licenses/mit-license
 */
package com.gmail.mugucupsoup.android.LightMeter;

import com.gmail.mugcuposup.android.R;
import com.gmail.mugucupsoup.android.Exif.*;

import java.io.IOException;
import java.util.HashMap;

import android.media.AudioManager;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;

public class MainActivity extends LightMeterActivity implements SurfaceHolder.Callback {

  Camera camera;
  SurfaceView surfaceView;
  SurfaceHolder surfaceHolder;
  boolean previewing = false;
  LayoutInflater controlInflater = null;
  int silentMode;

  final int RESULT_SAVEIMAGE = 0;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.camera_preview);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    getWindow().setFormat(PixelFormat.UNKNOWN);
    surfaceView = (SurfaceView) findViewById(R.id.camerapreview);
    surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    controlInflater = LayoutInflater.from(getBaseContext());
    View viewControl = controlInflater.inflate(R.layout.camera_control,null);
    LayoutParams layoutParamsControl = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
    this.addContentView(viewControl, layoutParamsControl);

    Button buttonTakePicture = (Button) findViewById(R.id.exposure);
    buttonTakePicture.setOnClickListener(new Button.OnClickListener() {
      @Override
      public void onClick(View arg0) {
        AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
          int streamType = AudioManager.STREAM_SYSTEM;
          mgr.setStreamSolo(streamType, true);
        camera.takePicture(null, null, myPictureCallback_JPG);
      }
    });
    
    showUsageDialog(R.string.usage_explain_preview);
  }

  @SuppressLint("UseValueOf")
  public void readExif(byte[] data) {
    
    ExifInfomation ei = new ExifInfomation();
    try {
      ei.readImage(data,true);
    } catch (IOException e1) {
      e1.printStackTrace();
      return;
    }
    
    ExifInfo exifInfo = new ExifInfo();
    String exposureTime=null, fnumber=null;
    int isoRatings=0;
    HashMap<Integer,ExifTag> exifTags = ei.getExifTags();
    if(exifTags!=null){
      ExifTag et;
      et = ei.getByName("ExposureTime",exifTags);
      if(et!=null){
        exposureTime = et.getStrValues().firstElement();
        if(exposureTime != null){
          exifInfo.setExposureTimeStr(exposureTime);
        }
      }
      et = ei.getByName("FNumber",exifTags);
      SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
      boolean usePreferenceFnumber = pref.getBoolean("checkbox_fnumber_preference", false);
      if(et!=null && !usePreferenceFnumber){
        fnumber = et.getStrValues().firstElement();
        if(fnumber != null){
          exifInfo.setFNumberStr(fnumber);
        }
      }else{
        exifInfo.setFNumberStr(pref.getString("list_fnumber_preference",getString(R.string.default_fnumber)));
        exifInfo.setHasFnumber(false);
      }
      
      et = ei.getByName("ISOSpeedRatings",exifTags);
      if(et!=null){
        String ISOSpeedRatings = et.getStrValues().firstElement();
        if(ISOSpeedRatings != null){
          isoRatings = new Integer(ISOSpeedRatings).intValue();
          exifInfo.setIsoValue(isoRatings);
        }
      }      
      
      ExifThumbnail ethumb = ei.getExifTumbnail();
      if(ethumb!=null){
        byte[] imagedata = ethumb.getImageBytes();
        exifInfo.setThumbBytes(imagedata);// for show in ResultView
      }

    }
    
    Intent intent = new Intent(this,com.gmail.mugucupsoup.android.LightMeter.ResultActivity.class);
    intent.putExtra("ExposureTimeInfo", exifInfo);
    startActivity(intent);
  }

  PictureCallback myPictureCallback_JPG = new PictureCallback() {
    @Override
    public void onPictureTaken(byte[] arg0, Camera arg1) {
      AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
        int streamType = AudioManager.STREAM_SYSTEM;
        mgr.setStreamSolo(streamType, false);
      readExif(arg0);
      camera.startPreview();
    }
  };

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    if (previewing) {
      camera.stopPreview();
      previewing = false;
    }

    if (camera != null) {
      try {
        camera.setPreviewDisplay(surfaceHolder);
        camera.startPreview();
        previewing = true;
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    camera = Camera.open();
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    camera.stopPreview();
    camera.release();
    camera = null;
    previewing = false;
  }
  
  @Override
  public void onRestart(){
    super.onRestart();
    showUsageDialog(R.string.usage_explain_preview);
  }

}

Java Source Code List

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